Add e2e tests with Kubernetes Kind

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

.github/workflows/e2e.yaml

@@ -0,0 +1,47 @@
+name: e2e
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ '*' ]
+    tags-ignore: [ '*' ]
+
+jobs:
+  kubernetes:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup Flux
+        uses: fluxcd/flux2/action@main
+      - name: Setup Kubernetes
+        uses: helm/kind-action@v1.8.0
+        with:
+          cluster_name: flux
+          version: v0.20.0
+          # The versions below should target the newest Kubernetes version
+          # Keep this up-to-date with https://endoflife.date/kubernetes
+          node_image: kindest/node:v1.28.0@sha256:9f3ff58f19dcf1a0611d11e8ac989fdb30a28f40f236f59f0bea31fb956ccf5c
+          kubectl_version: v1.28.0
+      - name: Install Flux in Kubernetes Kind
+        run: flux install
+      - name: Setup cluster reconciliation
+        run: |
+          flux create source git flux-system \
+          --url=${{ github.event.repository.html_url }} \
+          --branch=${GITHUB_REF#refs/heads/} \
+          --ignore-paths="clusters/**/flux-system/"
+          flux create kustomization flux-system \
+          --source=flux-system \
+          --path=./clusters/test
+      - name: Verify cluster reconciliation
+        run: |
+          kubectl -n flux-system wait kustomization/monitoring-controllers --for=condition=ready --timeout=10m
+          kubectl -n flux-system wait kustomization/monitoring-configs --for=condition=ready --timeout=1m
+      - name: Debug failure
+        if: failure()
+        run: |
+          kubectl -n flux-system logs deploy/source-controller
+          kubectl -n flux-system logs deploy/kustomize-controller
+          kubectl -n flux-system logs deploy/helm-controller
+          flux get all --all-namespaces

.github/workflows/test.yaml

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+name: test
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches: [ '*' ]
+    tags-ignore: [ '*' ]
+
+jobs:
+  manifests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup yq
+        uses: fluxcd/pkg/actions/yq@main
+      - name: Setup kubeconform
+        uses: fluxcd/pkg/actions/kubeconform@main
+      - name: Setup kustomize
+        uses: fluxcd/pkg/actions/kustomize@main
+      - name: Validate manifests
+        run: ./scripts/validate.sh

scripts/validate.sh

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+#!/usr/bin/env bash
+
+# This script downloads the Flux OpenAPI schemas, then it validates the
+# Flux custom resources and the kustomize overlays using kubeconform.
+# This script is meant to be run locally and in CI before the changes
+# are merged on the main branch that's synced by Flux.
+
+# Copyright 2023 The Flux authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Prerequisites
+# - yq v4.34
+# - kustomize v5.0
+# - kubeconform v0.6
+
+set -o errexit
+set -o pipefail
+
+# mirror kustomize-controller build options
+kustomize_flags=("--load-restrictor=LoadRestrictionsNone")
+kustomize_config="kustomization.yaml"
+
+# skip Kubernetes Secrets due to SOPS fields failing validation
+kubeconform_flags=("-skip=Secret")
+kubeconform_config=("-strict" "-ignore-missing-schemas" "-schema-location" "default" "-schema-location" "/tmp/flux-crd-schemas" "-verbose")
+
+echo "INFO - Downloading Flux OpenAPI schemas"
+mkdir -p /tmp/flux-crd-schemas/master-standalone-strict
+curl -sL https://github.com/fluxcd/flux2/releases/latest/download/crd-schemas.tar.gz | tar zxf - -C /tmp/flux-crd-schemas/master-standalone-strict
+
+find . -type f -name '*.yaml' -print0 | while IFS= read -r -d $'\0' file;
+  do
+    echo "INFO - Validating $file"
+    yq e 'true' "$file" > /dev/null
+done
+
+echo "INFO - Validating clusters"
+find ./clusters -maxdepth 2 -type f -name '*.yaml' -print0 | while IFS= read -r -d $'\0' file;
+  do
+    kubeconform "${kubeconform_flags[@]}" "${kubeconform_config[@]}" "${file}"
+    if [[ ${PIPESTATUS[0]} != 0 ]]; then
+      exit 1
+    fi
+done
+
+echo "INFO - Validating kustomize overlays"
+find . -type f -name $kustomize_config -print0 | while IFS= read -r -d $'\0' file;
+  do
+    echo "INFO - Validating kustomization ${file/%$kustomize_config}"
+    kustomize build "${file/%$kustomize_config}" "${kustomize_flags[@]}" | \
+      kubeconform "${kubeconform_flags[@]}" "${kubeconform_config[@]}"
+    if [[ ${PIPESTATUS[0]} != 0 ]]; then
+      exit 1
+    fi
+done